8. Replace the cover screws.
9. With the handwheel fully clockwise, the stroke position indicator show read (000). If
not, remove the handwheel assembly form the cover assembly, turn to the (000)
setting and replace.
10. Align the potentiometer as described under “Repairs”.
11. Confirm free operation of mechanism and limit switch setup, as described under
“Installation”.
Re-alignment –Explosion Proof
1. Disconnect the power source to the drive motor and actuator.
2. Remove the screws to the rear gearbox subcover, Item #529A. Refer to Figures 8 and
9.
3. Manually rotate the motor coupling until the oscillating housing is vertical. It may be
necessary to remove pressure from the piping system.
4. Remove the cotter pin, Item #539, nut, Item # 535, and washer, Item #534 from the
end of the diamond screw shaft on top of the housing.
5. Remove the screws to the rear gearbox cover, Item #526A.
6. Lift the cover slightly and pull it back towards the motor. As the shaft disengages, the
miter gear, Item #533, bushing, Item #532, and bushing pin, Item #538, will come
loose. Don’t allow them to fall into the gear box.
7. Check to see that the block Item #352, inside he oscillating housing, Item #358, is at
the top by turning the miter gear, Item #357, clockwise. Ref to Figure 5.
8. Set the stroke indicator two digits lowers than the setting at which the limit switch
opened (See Step 2 of “Preliminary Check”).
9. If the diamond shaft is dry, lightly coat it with grease.
10. Hold the cover of the pump and insert the shaft into the housing bore as you lower the
cover in place. Make sure that the miter gear, bushing and bushing pin are in place
and that the stroke remains as set in Step 8.
11. Replace the washer and nut on the shaft. Snug the nut and then back it off to the
nearest hole for insertion of the cotter pin.
12. Replace the cover screws, subcover and coupling guard.
13. With the handwheel fully clockwise, the stroke position indicator should read (000. If
not, remove the handwheel assembly from the cover assembly, turn to the (000)
setting and replace.
14. Align the potentiometer as described under “Repairs”.
15. Confirm free operation of mechanism and limit switch setup, as described under
“Installation”.
6.4 Brake Air Gap
1. Check the axial air gaps between the mating halves of the brake and clutch
assemblies, Items #638 and #646 on Figures 6 and 7. The gap specifications are
0.010-0.040 inches.
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